import {Buffer} from "buffer";
import {AxdrEnum} from "../asn1.axdr/AxdrEnum";
import {Data} from "./Data";
import {AxdrType} from "../asn1.axdr/AxdrType";
import {ReverseByteArrayInputStream} from "../ReverseByteArrayInputStream";
import {ReverseByteArrayOutputStream} from "../ReverseByteArrayOutputStream";


export class Region implements AxdrType{

    dataCode : Buffer | null = null;
    unit : AxdrEnum | null = null;
    sval : Data | null = null;
    eval : Data | null = null;

    constructor() {

    }

    set_dataCode(dataCode : Buffer){
        this.dataCode = dataCode;
    }

    set_all(unit : AxdrEnum, sval : Data, evl : Data){
        this.unit = unit;
        this.sval = sval;
        this.eval = evl;
    }

    decode(input: ReverseByteArrayInputStream): number {
        let codeLength = 0;

        this.unit = new AxdrEnum();
        this.unit.set_const();
        codeLength += this.unit.decode(input);

        this.sval = new Data();
        codeLength += this.sval.decode(input);

        this.eval = new Data();
        codeLength += this.eval.decode(input);

        return codeLength;
    }

    encode(output: ReverseByteArrayOutputStream): number {
        let codeLength;

        if (this.dataCode != null) {
            codeLength = this.dataCode.length;
            for (let i = this.dataCode.length - 1; i >= 0; i--) {
                output.write(this.dataCode[i]);
            }
        } else {
            if(this.unit != null && this.eval && this.sval != null){
                codeLength = 0;
                codeLength += this.eval.encode(output);

                codeLength += this.sval.encode(output);

                codeLength += this.unit.encode(output);
            }else{
                throw new Error("unit or sval or eval is null");
            }
        }
        return codeLength;
    }

    encodeAndSave(encodingSizeGuess: number) {
        let revOStream = new ReverseByteArrayOutputStream();
        revOStream.setBufSize(encodingSizeGuess);
        this.encode(revOStream);
        this.dataCode = revOStream.getArray();
    }

    toString(): string {
        if (this.unit != null && this.sval != null && this.eval != null) {
            return "sequence: {"+ "unit: " + this.unit + ", sval: " + this.sval + ", eval: " + this.eval  + "}";
        } else {
            return "unit or sval or eval is null";
        }
    }

}
